Great thread! looks like i got some reading to do! After i read these links, I will reply......but for now-
I would think, for polyps, a flow strong enough to keep their mats clean of debris, but not strong enough to cause than to close would be best. I also think a current in tank that promotes broken down, or semi broken down food sources to get carried within their reach, to feed them, would be ideal.
This reminds me of a post I read, long ago, about a "Sweet spot" in an aquarium, for polyps.....
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